Description

With this function you can create a simple effect above all
instances of your room (it is actually created at a depth of
-100000). If the effect is anything other ef_rain or ef_snow then you can define an x/y
position to create the effect, and the size can be a value of 0, 1,
or 2, where 0 is small, 1 is medium and 2 is large.

It is worth noting that these effects can have their drawing
toggled on and off, as well as have their drawing paused, by using
the functions part_system_automatic_draw
and part_system_automatic_update
with the appropriate value for the particle system index (where 0
is for effects below and 1 is for effects above).